Packer

The utility model relates to a packer to solve the problem that in the prior art, a steel belt of an expansion rubber sleeve of a packer is prone to breakage in the repeated setting and unsetting process, an inner container is punctured, and consequently the packer is unsealed. The packer comprises a central pipe, the middle of the outer side of the central pipe is sleeved with an expansion rubbersleeve, the upper end and the lower end of the expansion rubber sleeve are fixedly connected with an upper steel sleeve and a lower steel sleeve, steel belts are arranged in shoulders of the two endsof the expansion rubber sleeve, and protective rings for protecting the steel belts are arranged at the connecting positions of the steel belts at at least one end of the expansion rubber sleeve andthe steel sleeves. According to the packer adopting the structure, the toughness of the steel belt of the expansion rubber sleeve can still be kept in the repeated setting and unsetting process undera well, and the problem that